JP2006118810A - Heat storage type air conditioner - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To perform a cooling operation that suppresses power consumption in the daytime and has high energy consumption efficiency. <P>SOLUTION: This heat storage type air conditioner has a circuit where a compressor 1, an indoor heat exchanger 3, a regenerative heat exchanger 11 that is disposed in a heat storage tank having a regenerative medium and exchanges heat between it and the regenerative medium in the heat storage tank, a second throttling device 12, and indoor heat exchangers 30a and 30b are sequentially connected. In a cooling operation utilizing the heat storage, an operation that does not impart an excessive cooling temperature to an outlet of the outdoor heat exchanger 3 is performed. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a regenerative air conditioner that performs a regenerative cooling operation.

  The conventional heat storage type air conditioner performs an operation in which the outlet refrigerant state of the heat source side heat exchanger (condenser) is in a liquid state during daytime heat storage use cooling operation. (For example, see Patent Document 1)

JP-A-5-133635 (FIG. 2)

As a general refrigerant charging method during a test operation, a conventional heat storage type air conditioner is configured such that the outlet refrigerant state of the heat source side heat exchanger (condenser) becomes a supercooled liquid state during daytime heat storage-based cooling operation. Set the amount of refrigerant. In other words, this is to prevent the refrigerant shortage operation.
By the way, the heat exchange capacity of the heat source side heat exchanger determines the refrigerant condensing temperature and the compressor discharge pressure, but the heat exchange of the heat source side heat exchanger is increased by increasing the outlet refrigerant subcooling degree of the outdoor heat exchanger. Since the efficiency decreases, the condensation temperature of the refrigerant rises and the compressor discharge pressure increases. Therefore, there is a problem that the power consumption of the compressor is increased, and as a result, the energy consumption efficiency of the air conditioner is lowered and the electricity bill is increased.

  The present invention has been made to solve the above-described problems, and a first object of the invention is to suppress power consumption in the daytime and perform a cooling operation with high energy consumption efficiency. In other words, by reducing the amount of power consumed in the daytime, the electricity charge during the daytime is reduced and the amount of heat storage is increased. It seeks to obtain a harmony device.

  On the other hand, if the outlet refrigerant state of the heat source side heat exchanger (condenser) is in the supercooled liquid state during the daytime heat storage cooling operation as usual, the daytime power consumption increases and the electricity bill increases. The energy consumption efficiency throughout the day (cooling efficiency using daily heat storage) is high, and is effective in reducing annual power consumption and carbon dioxide emissions.

  Therefore, the second purpose is to provide an economical mode of operation that can effectively use low-cost late-night electricity with high energy consumption efficiency during daytime regenerative cooling operation, and energy consumption efficiency throughout the day (daily volume) An operation mode in which the heat storage utilization cooling efficiency) is increased, and a heat storage type air conditioner that can switch between these modes according to user needs is obtained.

  A heat storage type air conditioner according to the present invention includes a compressor, an indoor heat exchanger, a heat storage heat exchanger that is provided in a heat storage tank having a heat storage medium and performs heat exchange with the heat storage medium in the heat storage tank, an expansion device, A refrigerant circuit in which indoor heat exchangers are sequentially connected is provided, and the refrigerant charging amount is adjusted so that the refrigerant state at the outlet of the outdoor heat exchanger becomes a gas-liquid two-phase state during daytime heat storage-based cooling operation.

  In the refrigerant circuit, or by adjusting the circulating refrigerant amount of the refrigerant circuit, an operation mode in which the refrigerant state at the outlet of the outdoor heat exchanger is changed to a supercooled liquid state or a gas-liquid two-phase state during daytime heat storage-based cooling operation. It is possible to switch between these modes.

  Since the regenerative air conditioner according to the present invention performs an operation in which the refrigerant state at the outlet of the outdoor heat exchanger (condenser) becomes a gas-liquid two-phase state during daytime regenerative cooling operation, the heat exchange efficiency of the outdoor exchanger is high. By increasing the temperature, the refrigerant condensing temperature is lowered, and the compressor discharge pressure is also lowered. Therefore, the power consumption of the compressor is reduced, and as a result, the regenerative cooling operation with high energy consumption efficiency is performed. In other words, the amount of electricity consumed during the daytime can be reduced and the amount of heat stored can be increased, that is, the amount of stored heat can be increased at night. Has the effect.

  Also, in the refrigerant circuit or by adjusting the circulating refrigerant amount of the refrigerant circuit, the refrigerant state at the outlet of the outdoor heat exchanger can be switched between the supercooled liquid state or the gas-liquid two-phase state during daytime heat storage cooling operation. Therefore, it is possible to set an operation mode with high economic efficiency and an operation mode with high cooling efficiency using daily heat storage and can be switched according to the user's needs.

Embodiment 1 FIG.
FIG. 1 shows a refrigerant circuit diagram according to Embodiment 1 of the present invention. In the figure, the outdoor unit A, the heat storage unit B, and the indoor units C1 and C2 are sequentially connected by refrigerant pipes of a gas pipe P1 and a liquid pipe P2.
The outdoor unit A branches from the outlet of the compressor 1, the four-way valve 2, the outdoor heat exchanger 3, the supercooling heat exchanger 4, and the supercooling heat exchanger 4, and passes through the first throttle mechanism 5 to generate supercooling heat. It consists of a first bypass pipe 6 that flows through the other side of the exchanger 4 and is connected to the primary side of the accumulator 7 that is connected to the suction side of the compressor 1.
The heat storage unit B has the following configuration. The other branched from the outlet of the supercooling heat exchanger 4 is connected to the liquid pipe P2, and the refrigerant pipe branched from the liquid pipe P2 passes through the second throttle mechanism 12 and enters the heat storage tank 10 having the heat storage medium. It is provided and connected to a heat storage heat exchanger 11 that exchanges heat with the heat storage medium in the heat storage tank 10. Further, a circuit branching from the outlet of the heat storage heat exchanger 11 and returning to the liquid pipe P2 via the second on-off valve 15 and the other branching from the outlet of the heat storage heat exchanger 11 are the first on-off valve 14. Is connected to the gas pipe P1. A third on-off valve 16 is provided on the liquid pipe P <b> 2 between the branch point to the second throttle mechanism 12 and the junction point from the second on-off valve 15.
The indoor units C1 and C2 branched from the liquid pipe P2 and connected to each other are connected to the indoor throttle mechanisms 31a and 31b and the indoor heat exchangers 30a and 30b, respectively, and merge with the gas pipe P1.
The outdoor heat exchanger 3 is provided with an outdoor heat exchanger refrigerant temperature detection means 40 and an outdoor heat exchanger refrigerant outlet temperature detection means 41.

Next, the operation will be described. First, at the time of cold storage operation at night, the four-way valve 2 communicates with the outdoor heat exchanger 3 side. Therefore, the refrigerant gas discharged from the compressor 1 is condensed in the outdoor heat exchanger 3 and is supercooled in the supercooling heat exchanger 4. Next, since the 3rd on-off valve 16 is a closed state at the time of a cool storage operation, it flows into the 2nd expansion mechanism 12 side, and is decompressed by the 2nd expansion mechanism 12, and the thermal storage medium of the thermal storage tank 10 and a thermal storage heat exchanger Heat is exchanged at 11, and cold energy is stored. At this time, the heat storage medium uses water or the like to store cold heat using sensible heat and latent heat. The refrigerant flowing out of the heat storage heat exchanger 11 flows to the gas pipe P1 side because the second on-off valve 15 is closed and the first on-off valve 14 is open, and is taken into the accumulator 7 and the compressor 1 Follow.
The other refrigerant branched from the outlet of the supercooling heat exchanger 4 is depressurized by the first throttle mechanism 5, and after the other refrigerant is supercooled by the supercooling heat exchanger 4, It flows into the primary side.

Next, during the cooling operation using heat storage, the refrigerant gas discharged from the compressor 1 is condensed in the outdoor heat exchanger 3 to be in a liquid state because the four-way valve 2 communicates with the outdoor heat exchanger 3 side. The degree of supercooling in the refrigerant liquid state at the outlet of the outdoor heat exchanger 3 can be detected as a difference between detection values of both the outdoor heat exchanger refrigerant temperature detection means 40 and the outdoor heat exchanger refrigerant outlet temperature detection means 41. .
Thereafter, the refrigerant passes from the supercooling heat exchanger 4 through the liquid pipe P2, and the third on-off valve 16 is closed, so that the refrigerant branches to the second throttle mechanism 12 side, passes through the second throttle mechanism 12, and stores heat. Heat is exchanged between the heat storage medium of the tank 10 and the heat storage heat exchanger 11 to increase the degree of supercooling of the refrigerant. And since the 1st on-off valve 14 is a closed state and the 2nd on-off valve 15 is in an open state from the heat storage heat exchanger 11, it flows into the indoor units C1 and C2 from the liquid pipe P2 side, and the indoor throttling mechanisms 31a and 32b The pressure is reduced and evaporated in the indoor heat exchangers 30a and 30b, cooling operation is performed, flows into the gas pipe P1, and follows the path taken into the accumulator 7 and the compressor 1.

FIG. 2 shows the state of the refrigeration cycle in Embodiment 1 of the present invention on a ph diagram. The operation will be described with reference to FIG.
Normally, the outlet refrigerant state of the heat source side heat exchanger during the heat storage-based cooling operation is a liquid state. This is because when charging the refrigerant, the refrigerant filling amount is set so that the degree of supercooling of the outdoor heat exchanger 3 is slightly increased due to fear of insufficient refrigerant during cooling using the heat storage. At this time, as indicated by a dotted line in FIG. 2, the high-temperature and high-pressure gas refrigerant (point A in FIG. 2) discharged from the compressor 1 is heated with a medium such as air or water in the outdoor heat exchanger 3 (condenser). 2 is exchanged (point B in FIG. 2), and heat exchange is performed with a heat storage medium (for example, ice or brine) in the heat exchanger 11 in the heat storage tank, and the refrigerant is supercooled to cause high-pressure liquid refrigerant (in FIG. 2). Point C). This high-pressure liquid refrigerant is decompressed by the expansion device 4 to form a low-temperature low-pressure gas refrigerant (point D in FIG. 2) and supplied to the use-side heat exchanger 5 (evaporator), thereby cooling the use-side space. Do. The low-pressure gas refrigerant (point E in FIG. 2) that has exchanged heat in the use-side heat exchanger 5 is again sucked and discharged into the compressor 1.

  Next, in the case of cooling operation using heat storage, mainly reducing the amount of power consumed in the daytime, as shown by the solid line in FIG. 2, the state of the refrigerant at the outlet of the outdoor heat exchanger 3 (FIG. The refrigerant charging amount is set so that the inner point B) is in a gas-liquid two-phase state (for example, a dryness of 0 to 0.5). In other words, the refrigerant at the outlet of the outdoor heat exchanger 3 is charged less than the refrigerant charging amount in the former liquid state. Thereby, the heat exchange amount in the outdoor heat exchanger 3 decreases, and the heat exchange amount in the heat storage heat exchanger 11 in the heat storage tank 10 increases. By improving the heat exchange efficiency in these condensation heat transfer processes, the condensation temperature of the refrigerant on the refrigeration cycle decreases, and the discharge pressure of the compressor 1 decreases. As a result, the compressor 1 performs high-efficiency operation with low energy consumption, and the heat storage type air conditioner can perform operation with low energy consumption efficiency in the regenerative cooling operation.

  Further, the second throttle mechanism 12 in FIG. 1 has a variable capacity because pressure loss occurs when throttled, and is wasted by opening it as much as possible or opening the refrigerant flow resistance to almost the same level. It is good to suppress pressure loss. If it does so, it will become possible to perform the operation | movement with small energy consumption efficiency as heat storage utilization cooling operation.

In addition, as shown in FIG. 2, the state of the refrigerant at the outlet of the outdoor heat exchanger 3 is a two-phase refrigerant as compared with the operation in which the outlet refrigerant state of the outdoor heat exchanger 3 is in the liquid state during the heat storage-based cooling operation. In the case of driving, the amount of heat storage usage is rather large. Therefore, when it is set as the same heat storage utilization cooling operation time, it is sufficient to increase the amount of cold storage.
If the amount of cold storage is increased, efficient operation with less energy consumption during cooling operation using heat storage during the daytime is performed, the night shift rate is increased, and inexpensive midnight power can be used effectively and economical operation is possible. It becomes.

FIG. 3 shows the above operation with a change of one day. That is, the cold storage operation is performed during the nighttime electric power hours, and the heat storage utilization cooling is performed in the daytime. If it does so, power consumption can be reduced with respect to a non-heat storage apparatus. After the heat storage is used up, the compressor cooling operation using non-heat storage is performed until the late-night power hours, and the cold storage operation is resumed.
FIG. 3A shows an operation in which the outlet refrigerant state of the outdoor heat exchanger 3 is in the liquid state during the cooling operation using the heat storage, and FIG. 3B shows the refrigerant state at the outlet of the outdoor heat exchanger 3 in the gas-liquid two-phase state. This is an operation that becomes a refrigerant. In the latter case, the power consumption during cold storage operation at night increases, but the power consumption can be reduced in the daytime heat storage cooling operation, and the difference in power consumption from the non-heat storage device, the so-called peak shift power consumption can be increased. Here, an operation mode (FIG. 3A) in which the outlet refrigerant state of the outdoor heat exchanger 3 is in a liquid state during cooling operation using heat storage and an operation in which the refrigerant state at the outlet of the outdoor heat exchanger 3 is a two-phase refrigerant. If the mode (Fig. 3 (b)) is set and can be selected, in the former operation mode, operation with high daily energy consumption efficiency (cooling efficiency using daily heat storage) can be performed, and carbon dioxide emissions And driving that is friendly to the global environment. In the case of the latter operation mode, efficient operation with less energy consumption during daytime heat storage cooling operation is performed, the night shift rate is increased, and inexpensive midnight power can be used effectively and economical operation is possible. . That is, the operation modes of both can be selected according to needs by increasing or decreasing the refrigerant charging amount.

Embodiment 2. FIG.
FIG. 4 is a refrigerant circuit diagram according to Embodiment 2 of the present invention. In the figure, the outdoor unit A, the heat storage unit B, and the indoor units C1 and C2 are sequentially connected by refrigerant pipes of a gas pipe P1 and a liquid pipe P2.
The outdoor unit A branches from the outlet of the compressor 1, the four-way valve 2, the outdoor heat exchanger 3, the supercooling heat exchanger 4, and the supercooling heat exchanger 4, and passes through the first throttle mechanism 5 to generate supercooling heat. It consists of a first bypass pipe 6 that flows through the other side of the exchanger 4 and is connected to the primary side of the accumulator 7 that is connected to the suction side of the compressor 1.
The heat storage unit B has the following configuration. The other branched from the outlet of the supercooling heat exchanger 4 is connected to the liquid pipe P2, and the refrigerant pipe branched from the liquid pipe P2 passes through the second throttle mechanism 12 and enters the heat storage tank 10 having the heat storage medium. It is provided and connected to a heat storage heat exchanger 11 that exchanges heat with the heat storage medium in the heat storage tank 10. Further, a bypass circuit P21 that bypasses the second throttle mechanism 12 and includes the fourth on-off valve 18 is provided. Further, a circuit branching from the outlet of the heat storage heat exchanger 11 and returning to the liquid pipe P2 via the second on-off valve 15 and the other branching from the outlet of the heat storage heat exchanger 11 are the first on-off valve 14. Is connected to the gas pipe P1. A third on-off valve 16 is provided on the liquid pipe P <b> 2 between the branch point to the second throttle mechanism 12 and the junction point from the second on-off valve 15.
The indoor units C1 and C2 branched from the liquid pipe P2 and connected to each other are connected to the indoor throttle mechanisms 31a and 31b and the indoor heat exchangers 30a and 30b, respectively, and merge with the gas pipe P1.

  Next, the operation will be described. Since it is the same as Embodiment 1 at the time of the cold storage operation at night, description is abbreviate | omitted. Next, in the regenerative cooling operation, when the fourth open / close valve 18 is opened while the third on-off valve 16 and the second throttle mechanism 12 are closed, the bypass circuit P21 connected to the heat storage heat exchanger 11 is used as a refrigerant. Pass through. As a result, the flow path resistance of the refrigerant is further reduced than when the second throttling mechanism 12 is fully opened, so that useless pressure loss can be suppressed and an operation with low energy consumption efficiency can be performed as a heat storage cooling operation.

  The relationship between the refrigerant amount, the heat storage use amount, the cold storage amount, and the definition of the operation mode described in the first embodiment are also applicable to the present embodiment.

Embodiment 3 FIG.
FIG. 5 shows a refrigerant circuit diagram according to Embodiment 3 of the present invention. In the figure, the outdoor unit A, the heat storage unit B, and the indoor units C1 and C2 are sequentially connected by refrigerant pipes of a gas pipe P1 and a liquid pipe P2.
The outdoor unit A branches from the outlet of the compressor 1, the four-way valve 2, the outdoor heat exchanger 3, the supercooling heat exchanger 4, and the supercooling heat exchanger 4, and passes through the first throttle mechanism 5 to generate supercooling heat. It consists of a first bypass pipe 6 that flows through the other side of the exchanger 4 and is connected to the primary side of the accumulator 7 that is connected to the suction side of the compressor 1.
The heat storage unit B has the following configuration. The other branched from the outlet of the supercooling heat exchanger 4 is connected to the liquid pipe P2, and the refrigerant pipe branched from the liquid pipe P2 passes through the second throttle mechanism 12 and enters the heat storage tank 10 having the heat storage medium. It is provided and connected to a heat storage heat exchanger 11 that exchanges heat with the heat storage medium in the heat storage tank 10. Further, a bypass circuit P21 that bypasses the second throttle mechanism 12 and includes a liquid reservoir 19 and a fourth on-off valve 18 is provided. Further, a circuit branching from the outlet of the heat storage heat exchanger 11 and returning to the liquid pipe P2 via the second on-off valve 15 and the other branching from the outlet of the heat storage heat exchanger 11 are the first on-off valve 14. Is connected to the gas pipe P1. A third on-off valve 16 is provided on the liquid pipe P <b> 2 between the branch point to the second throttle mechanism 12 and the junction point from the second on-off valve 15.
The indoor units C1 and C2 branched from the liquid pipe P2 and connected to each other are connected to the indoor throttle mechanisms 31a and 31b and the indoor heat exchangers 30a and 30b, respectively, and merge with the gas pipe P1.

Next, the operation will be described. Since it is the same as Embodiments 1 and 2 at the time of the cold storage operation at night, the description is omitted. Next, during the regenerative cooling operation, the operation mode in which the outlet refrigerant state of the outdoor heat exchanger 3 is in the liquid state during the regenerative cooling operation defined in Embodiment 1 and the outlet refrigerant state of the outdoor heat exchanger 3 are two. In each of the two modes of the operation mode to be a phase refrigerant, the refrigerant circulation path is different.
First, in the former operation mode, the refrigerant charging amount is set so that the degree of supercooling is given to the outlet refrigerant of the outdoor heat exchanger 3. The degree of supercooling in the refrigerant liquid state at the outlet of the outdoor heat exchanger 3 can be detected as a difference between detection values of both the outdoor heat exchanger refrigerant temperature detection means 40 and the outdoor heat exchanger refrigerant outlet temperature detection means 41. . In this state, in the former operation mode, the second on-off valve 18 and the third on-off valve 16 branch off from the liquid pipe P2, and the second throttling mechanism 12 is fully opened to connect to the heat storage heat exchanger 11. The circuit is configured to allow the refrigerant to pass through.
On the other hand, in the latter operation mode, the refrigerant charging method is the same as the former operation mode, the third on-off valve 16 and the second throttle mechanism 12 are closed, the fourth on-off valve 18 is opened, and the liquid is filled. The refrigerant passes through a bypass circuit P21 connected to the reservoir 19, the fourth on-off valve 18, and the heat storage heat exchanger 11.

  In the former operation mode, the fourth on-off valve 18 of the bypass circuit P21 is in the closed state, and the refrigerant passes through the second throttle mechanism 12 side, so that the refrigerant does not accumulate in the liquid reservoir 19 and becomes empty. On the other hand, in the latter operation mode, the second throttle mechanism 12 is closed and the fourth on-off valve 18 is open, so that the refrigerant flows into the bypass circuit P21 and the refrigerant liquid is accumulated in the liquid reservoir 19. It becomes. Here, since the refrigerant amount is the same regardless of the operation mode, the latter operation mode corresponds to a reduction in the refrigerant amount existing in the outdoor heat exchanger 3 by the amount of refrigerant accumulated in the liquid reservoir. In other words, when the capacity of the liquid reservoir 19 is determined, if the refrigerant state at the outlet of the outdoor heat exchanger 3 is set to be a two-phase refrigerant (wetness 0 to 0.5), it is not necessary to increase or decrease the refrigerant charging amount. The operation mode can be set, and the same effect as shown in the first embodiment can be obtained.

FIG. 6 is a schematic view of the refrigerant piping configuration in the vicinity of the liquid reservoir 19. Here, the liquid reservoir 19 is disposed above the liquid pipe P21.
FIG. 6A shows a state of operation mode in which the outlet refrigerant state of the outdoor heat exchanger 3 is in a liquid state, and FIG. 6B shows a two-phase outlet refrigerant state of the outdoor heat exchanger 3 during the heat storage cooling operation. The state of the operation mode used as a refrigerant | coolant is shown. Consider the case where the operation mode is switched. When the former Fig. 6 (a) is switched to the latter Fig. 6 (b), the two-layer refrigerant flows into the liquid reservoir 19 from the empty state (Fig. 6 (a)) and most of the liquid is liquid. The operation mode is easily switched to the satisfied state (FIG. 6B). Conversely, when switching from the latter FIG. 6 (b) to the former FIG. 6 (a), in the latter operation mode, the two-phase refrigerant flows in and the most part is filled with liquid (FIG. 6 (b)). When switching to the former operation mode, since the liquid reservoir 19 is above the liquid pipe, the remaining liquid is discharged from below the liquid reservoir 19 by the liquid head and flows out to the liquid pipe P21. Therefore, it becomes possible to easily switch to the state of the former operation mode (FIG. 6A).
In addition, although the liquid reservoir was taken up as a component part in the said example, what can temporarily accommodate a refrigerant | coolant, for example, large diameter piping, and other parts, may be sufficient.

Embodiment 4 FIG.
FIG. 5 shows a refrigerant circuit diagram according to Embodiment 4 of the present invention. Since the configuration is the same as that of the third embodiment, a description thereof will be omitted. Next, the operation will be described. Since the refrigerant charge amount of the refrigerant circuit is determined at the time of the regenerative cooling operation, the refrigerant becomes too sloppy and the surplus refrigerant is accumulated in the outdoor heat exchanger 3 during the cold storage operation. As a result, there is a problem that the degree of supercooling increases, the reactive heat transfer area of the liquid portion increases, the high pressure rises, and the energy consumption during cold storage operation increases.
Here, in the cold storage operation, the refrigerant gas discharged from the compressor 1 condenses in the outdoor heat exchanger 3 because the four-way valve 2 communicates with the outdoor heat exchanger 3 side, and the supercooling heat exchanger 4 To the gas pipe P2, but since the third on-off valve 16 is in a closed state, it branches to the second throttle mechanism 12 and is depressurized by the second throttle mechanism 12, and the heat storage medium and heat storage heat in the heat storage tank 10 Heat is exchanged in the exchanger 11 to store cold energy. At this time, the heat storage medium uses water or the like to store cold heat using sensible heat and latent heat. Further, the refrigerant flows from the heat storage heat exchanger 11 to the gas pipe P1 side because the second on-off valve 15 is closed and the first on-off valve 14 is open, and is taken into the accumulator 7 and the compressor 1 Follow. At this time, the degree of supercooling in the refrigerant liquid state at the outlet of the outdoor heat exchanger 3 is detected as the difference between the detection values of both the outdoor heat exchanger refrigerant temperature detecting means 40 and the outdoor heat exchanger refrigerant outlet temperature detecting means 41, The on-off valve 18 is opened when the degree of supercooling is equal to or higher than a predetermined value (for example, 5 to 20 ° C.) and is closed after the degree of supercooling is equal to or lower than a predetermined value (for example, 0 to 5 ° C.). Then, liquid refrigerant accumulates in the liquid reservoir 19 and the degree of supercooling of the outdoor heat exchanger 3 decreases. That is, the effective heat transfer area of the liquid portion is increased, the high pressure is reduced, and the energy consumption during the cold storage operation can be reduced.
Here, when the liquid reservoir 19 is disposed above the liquid pipe P21, the liquid accumulated in the liquid reservoir 19 by the liquid head flows out to the liquid pipe P21, so that the degree of supercooling at the outlet of the outdoor heat exchanger 3 is increased. If the liquid refrigerant is stored in the liquid reservoir 19 by repeating the above operation according to the above, an energy-efficient operation is possible during the cold storage operation.

Embodiment 5. FIG.
A fifth embodiment of the present invention will be described with reference to FIG. In the regenerative cooling operation, the indoor units C1 and C2 connected to each other are connected to the indoor throttling mechanisms 31a and 31b and the indoor heat exchangers 30a and 30b, respectively, and merge with the gas pipe P1, and the compressor from the accumulator 7 Follow the inhalation process to 1. In normal operation, the opening degree of the indoor throttle mechanisms 31a and 31b is controlled so that the degree of superheat of the outlet refrigerant of the indoor heat exchangers 30a and 30b becomes a predetermined value, for example, 0 ° C to 20 ° C. Here, the opening degree of the indoor throttle mechanisms 31a and 31b is opened by a certain degree so that the degree of superheat does not occur. Then, the outlet refrigerant of the indoor heat exchangers 30a and 30b is in a gas-liquid two-phase state, and excess liquid refrigerant is accumulated in the accumulator 7, so that the outlet refrigerant state of the outdoor heat exchanger 3 can be in a two-phase state. Then, an effect similar to that of the third embodiment is obtained, and an operation with high energy efficiency is possible without adjusting the refrigerant charging amount. The effects are the same in the refrigerant circuits of FIGS.

Embodiment 6 FIG.
A sixth embodiment of the present invention will be described with reference to FIG. The first on-off valve 14 is normally closed in the regenerative cooling operation, but the on-off valve 14 is kept constant when the degree of supercooling of the outdoor heat exchanger 3 exceeds a predetermined value (for example, 0 to 10 ° C.). Close after opening for a while. Then, the liquid refrigerant that has flowed out of the on-off valve 14 is accumulated in the accumulator 7, and the outlet refrigerant state of the outdoor heat exchanger 3 can be brought into a two-phase state. Then, an effect similar to that of the third embodiment is obtained, and an operation with high energy efficiency is possible without adjusting the refrigerant charging amount. The effects are the same in the refrigerant circuits of FIGS.

It is a refrigerant circuit figure in Embodiment 1, 5, 6 of this invention. It is a ph diagram which shows the state of the refrigerating cycle in Embodiments 1-6 of this invention. The power consumption transition of the day in Embodiment 1-6 of this invention is shown for every operation mode. It is a refrigerant circuit figure in Embodiment 2, 5, 6 of this invention. It is a refrigerant circuit figure in Embodiment 3, 4, 5, 6 of this invention. It is a refrigerant circuit figure in Embodiment 3 of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Compressor 2 Four-way valve 3 Outdoor heat exchanger 4 Supercooling heat exchanger 5 1st expansion device 6 1st bypass pipe 7 Accumulator 10 Heat storage tank 11 Heat storage tank 11 Heat exchanger 12 Second expansion device 14 1st On-off valve 15 Second on-off valve 16 Third on-off valve 18 Fourth on-off valve 19 Liquid reservoirs 30a, b Indoor heat exchanger 31a, b Indoor side expansion device 40 Outdoor heat exchanger refrigerant temperature detecting means 41 Outdoor heat Exchanger refrigerant outlet temperature detection means P1 Gas pipe P2 Liquid pipe P21 Bypass pipe A Outdoor unit B Heat storage tank unit C1, C2 Indoor unit

Claims (10)

A refrigerant circuit in which a compressor, a heat source side heat exchanger, a heat exchanger that is provided in a heat storage tank having a heat storage medium and performs heat exchange with the heat storage medium in the heat storage tank, an expansion device, and a use side heat exchanger are sequentially connected A heat storage type air conditioner that supercools the refrigerant by heat exchange with the cold stored in the heat storage tank during the heat storage cooling operation, wherein the outlet refrigerant state of the heat source side heat exchanger is in a gas-liquid two-phase state The regenerative air conditioner is characterized in that the amount of refrigerant enclosed in the refrigerant circuit is adjusted. A second expansion device is provided between the heat source side heat exchanger and the heat exchanger provided in the heat storage tank having the heat storage medium and performing heat exchange with the heat storage medium in the heat storage tank, and at the time of cooling operation using the heat storage The regenerative air conditioner according to claim 1, wherein the operation is performed with the throttle mechanism of the second throttle device fully opened or opened to a position where the refrigerant flow resistance does not substantially change. A second expansion device is provided between the heat source side heat exchanger and a heat exchanger provided in a heat storage tank having a heat storage medium and performing heat exchange with the heat storage medium in the heat storage tank, and the second throttle The regenerative air conditioning apparatus according to claim 1 or 2, wherein a bypass circuit for bypassing the apparatus is provided, and an on-off valve is provided in the bypass circuit. A refrigerant circuit in which a compressor, a heat source side heat exchanger, a heat exchanger that is provided in a heat storage tank having a heat storage medium and performs heat exchange with the heat storage medium in the heat storage tank, an expansion device, and a use side heat exchanger are sequentially connected A heat storage type air conditioner that performs supercooling of the refrigerant by heat exchange with the cold stored in the heat storage tank during the heat storage cooling operation, provided with a bypass circuit that bypasses the expansion device, and the refrigerant in the bypass circuit A heat storage type air conditioner comprising a housing means and an on-off valve. The regenerative air conditioner according to claim 4, wherein the refrigerant containing means is located above the liquid pipe. The regenerative air conditioner according to claim 4 or 5, wherein, during the cold storage operation, the on-off valve is opened and closed according to the degree of supercooling of the heat source side heat exchanger. A refrigerant circuit in which a compressor, a heat source side heat exchanger, a heat exchanger that is provided in a heat storage tank having a heat storage medium and performs heat exchange with the heat storage medium in the heat storage tank, an expansion device, and a use side heat exchanger are sequentially connected In a regenerative air conditioner that performs supercooling of the refrigerant by heat exchange with the cold energy stored in the heat storage tank during the heat storage utilization cooling operation, an accumulator is provided between the use side heat exchanger and the compressor, A heat storage air conditioner characterized in that a capacity-controllable expansion device is provided in the use-side heat exchanger primary-side expansion device, and control is performed to increase the capacity of the capacity-controllable expansion device to a predetermined value. . A refrigerant circuit in which a compressor, a heat source side heat exchanger, a heat exchanger that is provided in a heat storage tank having a heat storage medium and performs heat exchange with the heat storage medium in the heat storage tank, an expansion device, and a use side heat exchanger are sequentially connected In a regenerative air conditioner that performs supercooling of the refrigerant by heat exchange with the cold energy stored in the heat storage tank during the heat storage utilization cooling operation, an accumulator is provided between the use side heat exchanger and the compressor, A first open / close valve is provided between the heat exchanger provided in the heat storage tank having the heat storage medium and performing heat exchange with the heat storage medium in the heat storage tank, and the accumulator. A regenerative air conditioner that performs control of opening after a certain time and then closing. An operation mode in which the outlet refrigerant state of the heat source side heat exchanger is in a liquid state and an operation mode in which the outlet refrigerant state of the heat source side heat exchanger is in a gas-liquid two-phase state are provided. The regenerative air conditioner according to any one of Items 1 to 8. The heat storage amount in the operation mode in which the outlet refrigerant state of the heat source side heat exchanger is in the gas-liquid two-phase state is increased from the heat storage amount in the operation mode in which the outlet refrigerant state of the heat source side heat exchanger is in the liquid state. The heat storage type air conditioner according to claim 9,

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